Try installing the package "kdm-gdmcompat". This allows gnome-screensaver to work with kdm when switching users. This works for me on Ubuntu 12.04 (Precise Pangolin)/Linux Mint 13 (maya) in a gnome-fallback session.
Try installing the package "kdm-gdmcompat". This allows gnome-screensaver to work with kdm when switching users. This works for me on Ubuntu 12.04 (Precise Pangolin)/Linux Mint 13 (maya) in a gnome-fallback session.